Mao Yanzhe, Bai Jinglong, Zhang Mingxiang, Zhao Hao, Sun Gengzhi, Pan Xiaojun, Zhang Zhenxing, Zhou Jinyuan, Xie Erqing
School of Physical Science and Technology, Lanzhou University, 222 South Tianshui Road, Lanzhou 730000, China.
Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, 30 South Puzhu Road, Nanjing 211816, China.
Phys Chem Chem Phys. 2017 Mar 29;19(13):9223-9231. doi: 10.1039/c7cp01101f.
It was demonstrated that suitable interfaces between two materials can enhance the separation of photogenerated carriers. In this study, ZrO/ZnO interfaces with type I structure were designed and prepared by the electrospinning technique. The obtained ZrO/ZnO:Eu (ZZOE) composites are highly porous in the form of nanobelts with width of 600-700 nm, comprising ZnO and ZrO nanocrystals, and the Eu doping can hinder the t-m phase transition of ZrO. By tuning the annealing temperature, the inner stress and defects can be well controlled to improve the photoluminescence (PL) of the ZZOE porous nanobelts. Macro- and micro-PL spectra indicated that the body oxygen vacancies benefit the PL from Eu ions, whereas the surficial ones do not. The optimal parameters for the preparation of ZZOE porous nanobelts were also investigated. Finally, a charge transfer mechanism was proposed to illuminate the PLs from the ZZOE porous nanobelts.
结果表明，两种材料之间合适的界面可以增强光生载流子的分离。在本研究中，通过静电纺丝技术设计并制备了具有I型结构的ZrO/ZnO界面。所制备的ZrO/ZnO:Eu（ZZOE）复合材料呈纳米带形式，具有高度多孔性，宽度为600-700nm，由ZnO和ZrO纳米晶体组成，并且Eu掺杂可以阻碍ZrO的t-m相变。通过调节退火温度，可以很好地控制内应力和缺陷，从而提高ZZOE多孔纳米带的光致发光（PL）性能。宏观和微观PL光谱表明，体氧空位有利于Eu离子的PL发射，而表面氧空位则不然。还研究了制备ZZOE多孔纳米带的最佳参数。最后，提出了一种电荷转移机制来解释ZZOE多孔纳米带的PL发射。
